Capacitive Transduction for Liquid Crystal-Based Sensors, Part I: Ordered System

In this paper, the theory for tracking the average molecular orientation of a liquid crystal (LC) material via capacitive sensing of anisotropic media is presented. The candidate LC sensor structure utilizes interdigital electrodes. Two capacitive measurements in orthogonal direction can track the d...

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Bibliographic Details
Published in:IEEE sensors journal 2007-12, Vol.7 (12), p.1617-1624
Main Authors: Abu-Abed, A., Lindquist, R.G., Woo-Hyuck Choi
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Biological materials
Biosensors
capacitive sensing
Capacitive sensors
Chemical and biological sensors
Chemical sensors
Crystalline materials
Electrodes
Fingers
liquid crystal (LC)
Liquid crystals
Liquids
Mathematical analysis
Optical distortion
Orientation
Sensor systems
Sensors
Tracking
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Summary:In this paper, the theory for tracking the average molecular orientation of a liquid crystal (LC) material via capacitive sensing of anisotropic media is presented. The candidate LC sensor structure utilizes interdigital electrodes. Two capacitive measurements in orthogonal direction can track the director axis of nematic LC material in a homogenous ordered LC film. The sensitivity for the sensor at different alignments is studied. The candidate sensors have been fabricated and experimentally verified. Both experimental and calculated values for capacitances of selected interdigital fingers sensor structures are presented.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2007.908504